A Location Estimation Scheme Utilizing RSSI and Phase Values with Angled Antennas

Radio Frequency Identification (RFID) technology has gained significant attention in retail due to its applications in self-checkout systems, inventory control, and anti-theft gates. Precise location estimation is crucial for enabling diverse functionalities of RFID. However, conventional methods face challenges in achieving miniaturization in complex installation environments. This paper introduces an innovative location estimation scheme for RF tags that leverages the distinct characteristics of the Received Signal Strength Indicator (RSSI) and phase values. By employing angled antennas, we establish non-uniform communication areas, enabling the implementation of our proposed system. Through real-world experiments, we evaluate and provide empirical evidence that validates the effectiveness of our approach in accurately estimating the location of RF tags.